Eaton: cylinder deactivation tests show effective emission reduction – Fuel Smarts


Cylinder deactivation, or CDA, holds promise for low-emission diesel engines.

Photo: Eaton

Eaton said he demonstrated cylinder deactivation (CDA) as an effective technology to meet future global emissions requirements for diesel commercial vehicles.

To date, the technology has been evaluated with a one-piece Selective Catalytic Reduction (SCR) aftertreatment system with and without 48-volt electric heater.

“Our CDA technology has been proven to help our customers meet increasingly stringent emission regulations for diesel engines,” said Christopher Mancuso, Business Unit Director, Engine Air Management, Eaton’s Vehicle Group . “This comes at a time when many global automakers are determining what technologies they will use in next generation vehicles to reduce harmful emissions.”

New emissions regulations led by the California Air Resources Board, the United States Environmental Protection Agency and the European Commission are expected to be adopted in the coming years. These agencies, along with other national and international regulators, seek to significantly reduce greenhouse gas emissions and air pollutants produced by heavy trucks, vans and buses.

Rapid preheating of essential catalyst

Results from the Southwest Research Institute demonstrate that the use of CDA and a tightly coupled SCR catalyst reduced both nitrous oxide (NOx) and carbon dioxide (CO2) with fuel consumption savings of up to 40% at idle.

Previous results using CDA and a tightly coupled SCR catalyst have demonstrated compliance with upcoming US regulations for NOx and CO2 emissions for diesel commercial vehicles. Testing with the new low load cycle resulted in a 5% drop in CO2 while drastically reducing NOx. The assessment was developed by CARB to replicate the actual operations of urban tractors and professional vehicles with low engine loads.

Eaton’s 2021 testing with SwRI showed further progress, dropping NOx levels by 99.4% compared to the Federal Composite test procedure and lowering low-cycle NOx to well below current guidelines . In particular, the use of the same post-treatment system with the addition of a 48-volt electric heater located upstream of the SCR further reduced CO emissions.2.

CDA technology can also benefit automakers facing tougher emissions standards in Europe. The next set of requirements, known as Euro VII for heavyweights, are targeted for the second part of the decade.

In the United States, CARB is introducing stricter regulations as early as 2024, while the EPA has circled 2027 to begin enforcing stricter emission limits on new heavy vehicle models.

Collectively, these standards are designed to reduce exhaust NOx emissions by up to 90%, accelerating the need for global engine manufacturers to employ additional emission reduction strategies such as electric catalyst heating.


Sara H. Byrd